They might be needed for remote builds or the pre-build hook.

…-builds

Run pre-connect hooks before building

When booting non-primary role hosts we will always wait for a primary
role host to boor first.

So when booting in groups, if there are no primary role hosts in the
first batch, then booting will stall.

Sort primary role app_hosts first to avoid this.

Fixes: #1553

Clarify that proxy: true/proxy: false only belong in the role config,
not at the root level.

Ensure primary_role app hosts are sorted first

Instead of checking for the proxy key, we'll set the config to {} if it
is nil in the Kamal::Configuration::Proxy initializer.

This is a bit cleaner, and maybe it will help with
#1555 if somehow
@raw_config.key?(:proxy) is false but @raw_config.proxy is not nil.

It shouldn't be necessary to deploy the app on proxy reboot. When there
are multiple apps using the same proxy we'll only deploy the one we
run the reboot command from, so we don't always reboot anyway.

Default the proxy config if it is nil

Don't deploy on proxy reboot

Per role proxy docs